The Grimm reaper

Akida Tetzuya had tasted the bitterness of betrayal.
The person that some would say, should have been the only person he could truly trust.
This person proved to be Akida's worst enemy,and his greatest ally.
This person proved to be the only person he should never have trusted.
This person took everything from Akida and left him to die,but some grief is so great that even death will stay away.
This is the story of how the Hunter known as the Grimm Reaper came to be.